2. 自考
  3. has not been ,have not been ,had not been ; would be , would have been , will be If printing_______invented, we would not have b

has not been ,have not been ,had not been ; would be , would have been , will be If printing_______invented, we would not have b

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问题 has not been ,have not been ,had not been ; would be , would have been , will be
If printing_______invented, we would not have books and civilization _______thousands of years behind.
选项
答案had not been，would be
解析 句意：如果没有发明印刷术，我们将不会有书本，人类文明也会落后几千年。本题考查过去完成体的假设用法。表示对过去的假设时，在if，if only，as if等引导的分句中用had(not)v-ed结构。并列连词and连接并列结构，前面是would not have，根据句意，后面应是选肯定的would be。答案为had not been，would be。
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